WO2001039401A1 - Dispositif purgeur d'appel pour telephone portable a etalement du spectre - Google Patents

Dispositif purgeur d'appel pour telephone portable a etalement du spectre Download PDF

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Publication number
WO2001039401A1
WO2001039401A1 PCT/JP2000/008215 JP0008215W WO0139401A1 WO 2001039401 A1 WO2001039401 A1 WO 2001039401A1 JP 0008215 W JP0008215 W JP 0008215W WO 0139401 A1 WO0139401 A1 WO 0139401A1
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WO
WIPO (PCT)
Prior art keywords
frequency
radio wave
suppression
signal
band
Prior art date
Application number
PCT/JP2000/008215
Other languages
English (en)
Japanese (ja)
Inventor
Toru Kaneko
Original Assignee
Macros Japan Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Macros Japan Inc. filed Critical Macros Japan Inc.
Priority to AU14190/01A priority Critical patent/AU1419001A/en
Publication of WO2001039401A1 publication Critical patent/WO2001039401A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K2203/00—Jamming of communication; Countermeasures
    • H04K2203/10—Jamming or countermeasure used for a particular application
    • H04K2203/16—Jamming or countermeasure used for a particular application for telephony
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/45—Jamming having variable characteristics characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"

Definitions

  • the present invention relates to a mobile phone incoming call suppression device, and particularly to a mobile communication system of a cellular system, a spread spectrum transmission circuit for completely suppressing a range that cannot be completely suppressed by a conventional suppression method, in particular,
  • the present invention relates to an incoming call suppression device having a carrier frequency selection function, a frequency modulation function, a frequency modulation deviation amount variable function, an antenna unit, a monitoring function, an external interface function, a power supply unit, and the like.
  • a cellular type mobile telephone system is basically a mobile radio communication system using radio waves.Since it is a system based on multiplexing, it basically has a control channel for calling a specific mobile station. are doing. The mobile station normally receives a call from the base station via this control channel, and establishes a call between the stations on the radio channel.
  • the signal-to-noise ratio (SZN ratio) or the carrier signal power to interference signal power ratio (CZI ratio) at the time of demodulation is used to determine the electrical characteristics inside the communication equipment. It is important that the performance is necessary and sufficient. If this performance cannot be secured sufficiently, it has the disadvantage that it will not be possible to call the mobile station successfully.
  • This device takes advantage of the above drawbacks, and emits a radio wave in the specific area, location, or time that is the same frequency as the frequency assigned for the control channel for transmission by the base station and reception by the mobile station.
  • the purpose is to suppress incoming calls by interfering with the demodulation function of the receiver.
  • the suppression effect depends on scanning conditions. Furthermore, the peak value of the power of the suppression radio wave must be set to a level that does not adversely affect the environment. Under the above conditions, in order to sufficiently obtain the effect of suppressing incoming calls of mobile phones, there should be no time gap (unrestricted time) caused by scanning within the frequency band to be suppressed for more than the scheduled time. Thus, it is necessary to set the scan speed of the suppression radio wave to a high speed. However, the scanning speed is limited. Also, if the suppression bandwidth is widened, the gap will be widened at the same scanning speed. Therefore, considering the situation in which the suppression band shifts to a broadband with the advent of a new mobile phone, a dramatic improvement in performance is not expected in the future with the open loop method.
  • the device of the present invention uses a single or a plurality of interference radio waves by spectrum spreading that can obtain a flat suppression radio wave over a wide band, and secures the suppression band at a minimum necessary output level.
  • the purpose of the present invention is to obtain an intended and stable deteriorating radio wave by an oscillator circuit based on a PLL system using an oscillator, and to precisely and stably oscillate a carrier frequency to overcome the above-mentioned problems. It provides
  • the incoming call deterring device is a frequency generating circuit that generates a predetermined frequency.
  • a frequency generating circuit that generates a predetermined frequency.
  • Channel a spread spectrum circuit that spreads arbitrary baseband data over a predetermined bandwidth, a low-pass filter circuit that filters the spread spectrum signal over a predetermined bandwidth, and an analog signal that filters the filtered signal. It has a configuration in which a circuit for converting to a signal, a selecting device for selecting a center frequency to be transmitted, and a power amplifier, an antenna, and a power supply device for amplifying to a power sufficient for transmitting from an antenna are arranged and connected.
  • interference waves for frequencies including the control channel used in the cellular mobile telephone system, and emits deterrent waves in the room, which is a desired target deterrent room, in the room. .
  • a deterrent radio wave should be emitted below the mortar-shaped seating space, as in an outdoor hall, so that the deterrent effect is produced only inside the hall.
  • a desired incoming call deterring effect can be obtained.
  • the receiver that receives the interference signal transmitted from this device does not need to demodulate it correctly, so the baseband data transmitted from this device during spreading processing may be arbitrary.
  • the characteristic of the suppression device described in claim 2 is that the frequency band is generally assigned with different widths of a certain size as a whole of the cellular mobile telephone system, so that the effect is achieved for the entire desired frequency band.
  • the center frequency and bandwidth of the interfering radio waves can be changed sequentially in order to emit the interfering radio waves.
  • the feature of the suppression device described in claim 3 is to enhance the suppression effect in a desired band by providing a function of frequency-modulating the carrier center frequency of the interference radio wave in the frequency axis direction.
  • the feature of the suppression device described in claim 4 is that the function of changing the frequency shift amount of the frequency modulator enhances the suppression effect of the desired band and the band of the peripheral frequency.
  • the characteristic of the suppression device described in claim 5 is that, in general, fluctuations in electrical characteristics due to a frequency change of a device including a high-frequency semiconductor are absorbed, and a circuit for transmitting signals is used. It has an automatic gain adjustment device that corrects fluctuations in transmission power within the wavenumber band and obtains constant and stable transmission power at any transmission frequency.
  • the output power of the device is detected by the RF power detector 39, taken into the microphone processor 2 via the RF power detection signal 41, and transmitted to the RF port via the RF power control signal 36.
  • the feedback to one amplifier 34 keeps the RF output power of the device constant.
  • the features of the restraint device described in claim 6 play a role in adjusting the size of the area or range in which the effect of the restraint device is obtained. To obtain the effect locally, it is possible to reduce the transmission power, and it is possible to minimize the area where suppression is not required. Also, if the effect is obtained in a large range, the maximum output power is transmitted within the allowable power. If the range cannot be completely covered, multiple units may be installed and used.
  • the feature of the suppression device described in claim 7 is that an omnidirectional antenna or a directional antenna is connected to the suppression device, and a device that has directivity and a device that does not have directivity in the radio wave transmitted from the antenna are installed in the installation environment. By using them properly, it is useful, for example, to separate areas that you want to suppress from those that you do not. As a result, for example, while achieving a sufficient deterrent effect on the audience side of the theater, it is possible to reduce the power reaching from the deterrent device in an area that is not to be deterred, such as the outer part near the entrance. It is also possible to narrow the suppression range by giving the antenna directivity in the direction opposite to the arrival direction of radio waves from the base station.
  • the feature of the deterrent device described in claim 8 is to cope with the fact that different cellular mobile telephone carriers use different allocated frequencies in different regions.
  • modularizing the incoming call deterrent device it is possible to install only the necessary modules for each region and prevent unnecessary equipment investment by equipment installers.
  • the feature of the restraint device described in claim 9 is that it is convenient to remotely control the start or stop of the operation of the device or to remotely monitor the operation state of the device. Things. For example, when the device needs to be installed in a remote place where it is difficult to reach easily, it can be operated at hand through a wired or wireless communication means.
  • the feature of the suppression device described in claim 10 is that, while one purpose is to suppress the reception of the broadband CDMA, the suppression band is narrower than the desired suppression band, but the total transmission power of the suppression device is more than the target power value. In order to compensate for the area set narrower than the suppression band, that is, to cover the entire band of the suppression band In this way, the center frequency of this interference radio wave is changed.
  • the feature of the suppression device described in claim 11 is that, for one purpose, the suppression of the arrival of the wideband CDMA, a plurality of suppression bands narrower than a desired suppression band are provided, and the plurality of suppression bands are combined.
  • the combined transmission bandwidth of the plurality of suppression bands is set so that the total transmission power of the suppression device obtained by the above operation falls below a target value, and the interference radio wave due to the spread spectrum is emitted.
  • the center frequency of this interfering radio wave is changed so that a plurality of regions whose regions are set narrower than the band can be complemented, that is, the entire suppression band can be covered.
  • FIG. 1 is a block diagram showing one embodiment of the present invention.
  • FIG. 2 is a graph showing a frequency spectrum distribution of a PN generator overnight output in an electric signal waveform of a main part included in an embodiment of the present invention.
  • FIG. 3 is a graph showing a frequency response characteristic of an output of a digital filter with an electric signal waveform of a main part included in an embodiment of the present invention.
  • FIG. 4 is a graph showing a frequency distribution of an RF power amplifier output in an electric signal waveform of a main part included in the embodiment of the present invention.
  • FIG. 5 is an electric signal waveform of a main part included in the embodiment of the present invention. It is a graph which shows the frequency distribution of a dopasfill evening output.
  • FIG. 6 is a graph showing an outline of a carrier frequency allocation and a channel structure related to the implementation of the present invention.
  • FIG. 7 is a graph schematically showing the relationship between the carrier frequency allocation and the suppression band related to the implementation of the present invention.
  • the upper part of the figure shows the transmission frequencies of base stations corresponding to wireless microphones and cellular telephone carriers.
  • the band indicates the base station transmission frequency (horizontal axis indicates the base station transmission frequency), and the lower side indicates the transmission frequency band of the suppression device (the horizontal axis indicates the reception suppression frequency).
  • FIG. 8 is a perspective view showing an external view of the apparatus according to the embodiment of the present invention.
  • FIG. 9 is a three-dimensional graph showing an example in which desired circuit data is loaded into LSI and operated, and observed for a predetermined time.
  • FIG. 10 is a three-dimensional graph showing an example in which another circuit data is taken into LSI and operated, and observed for a predetermined time.
  • FIG. 1 shows a functional block diagram 1 of a main part of a suppression device according to an embodiment of the present invention, in which a plurality of crystal oscillators 4, 8, 17, 23, which generate at least one reference signal that can be integrated, a carrier frequency to be transmitted.
  • Microprocessor for controlling device for changing chip rate of PN or PN (pseudo random noise) generator or cut-off frequency of digital filter, detecting RF power and controlling transmission power or communicating with external equipment Circumferential circuit PLLPLL 7 including phase comparison circuit, loop filter 10, Oscillation circuit 16 for FM modulation that shifts the transmission frequency at a certain period and depth, frequency shift adjuster 19, loop filter 10 Adder 12 that adds the FM output signal 11 and the FM modulation signal 22 that is the output signal of the frequency shift adjuster 19, generates a high-frequency signal of the desired frequency in accordance with the output voltage of the adder 12.
  • VCO voltage controlled oscillator
  • PN generator 2 4 for generating a pseudo-random noise signal, to the desired bandwidth
  • Digital filter 27 for filtering DZA converter 30 for conversion to analog baseband signal
  • mixer 31 for mixing output 31 of DZA converter 30 and output of VCO 4 and converting to high frequency signal RF power amplifier 3 4 to amplify the output signal 3 3 of the mixer 3 2 to sufficient transmission power
  • RF bandpass filter 37 to prevent transmission of unnecessary radiation 37
  • RF power detector to detect the transmission power 39
  • An antenna 40 for transmitting high-frequency signals; a control program 3 for operating a microprocessor 2 for controlling the device; a wired serial communication interface 46 for external connection to an external computer (not shown); It comprises a wireless external interface 43 using radio waves or light, and a power supply unit 49 for supplying power to these devices.
  • This device is roughly divided into seven functional blocks, as shown in Fig. 1. The following describes the performance of each block.
  • Block 1 is a block centered on a PN generator 24 that generates pseudo-random noise over a wide band, for example, 1 to 5 MHz or more. And D / A converter 30 power is provided. It is desirable that the signal generated by the PN generator 24 has a sharp band edge with a sharp rise and fall and a small peak dip, that is, a rectangular shape. This can be seen in Figures 9 and 10.
  • the crystal oscillator 23 generates a clock signal that determines the chip rate, which is the spreading frequency of the PN generator 24.
  • the PN generator 24 is generally a combination of a plurality of multi-stage shift registers.
  • the chip rate selection signal 25 and the digital filter cutoff frequency selection signal 28 from the microprocessor the chip rate of the PN generator 24 and the blockage of the digital filter are controlled.
  • the cutoff frequency can be changed. As a result, it is possible to adjust a desired bandwidth to be suppressed.
  • Fig. 2 shows the frequency characteristics of the PN generator output signal 26.
  • the digital filter is used to cut off an unnecessary frequency band included in the PN generator output signal 26, and a single-pass filter is used.
  • the desired passband of the baseband signal is obtained by this filtering, and the frequency response characteristics of the digital filter output signal 29 are shown in FIG.
  • the D / A converter 30 converts the digitized baseband signal 29 to an analog baseband signal 31.
  • it is not always necessary to use the DZA comparator 30 and the digital filter output signal 31 may be sent directly to the mixer 32 through some buffer.
  • Block 2 shows the oscillator circuit that determines the center frequency of the RF carrier of the interference signal.
  • the PLL method is used to obtain the accuracy and stability of the carrier center frequency.
  • the PLL 7 outputs a PLL output signal 9 for driving the VCO 14 according to the carrier frequency selection signal 5 instructed by the microprocessor 2 and is input to the loop filter 10.
  • the loop filter 10 is set to a filter constant in consideration of the solid-state characteristics of the VCO 14 and the desired oscillation frequency characteristics, thereby optimizing the response characteristics of the loop system of the PLL type frequency generator.
  • the loop filter output signal 11 that has passed through the loop filter 10 passes through the adder 12 and is input to the frequency control terminal 13 of the VCO (voltage controlled oscillator) 14.
  • VC014 oscillates an RF frequency according to the voltage and outputs a carrier signal 15.
  • the PLL 7 includes, for example, a plurality of serially-connected frequency dividers for dividing the reference signal from the crystal oscillator 8 and a phase comparator, which are based on the carrier frequency selection signal 5.
  • a signal is selected from the reference signal and the output signals of the plurality of frequency dividers, the phase of the selected signal is compared with the phase of the PLL feedback signal 15, and a comparison signal having a voltage level corresponding to the difference is looped.
  • the frequency dividing circuit and the phase comparing circuit provide the selected signal ⁇
  • the frequency dividing circuit / phase comparing circuit may be provided with, instead of the frequency dividing circuit, for example, a plurality of serially connected frequency multiplying circuits for multiplying the reference signal from the crystal oscillator 8. .
  • the block 3 is connected to the block 2 in combination and includes an FM modulation oscillation circuit 16, a crystal oscillator 17, and a frequency shift adjuster 19.
  • the FM modulation source signal 18 accurately oscillated by the oscillation circuit for FM modulation based on the crystal oscillator 17 adjusts the frequency shift amount of the FM modulation by the frequency shift adjuster 19 and sends it to the adder 12.
  • the FM modulation frequency can be changed by the FM modulation circuit control signal 21 from the microprocessor 2, and the amount of deviation when performing FM modulation must also be changed by the frequency deviation control signal 20 from the microprocessor 2. Is possible.
  • the DC input voltage of the carrier frequency control terminal 13 fluctuates up and down and FM modulation is applied to obtain a more effective incoming call suppression effect. It is intended.
  • Block 4 mixes the analog baseband signal 31 generated in Block 1 with the carrier signal 15 generated in Block 2 and spreads and modulates the RF carrier frequency with a D / A converted analog signal.
  • RF spread signal 3 3 This signal is amplified to a desired high-frequency output power level by the RF power amplifier 35 in the next stage.
  • Figure 4 shows the frequency distribution.
  • PNW is a desired signal
  • SH is an unnecessary second harmonic.
  • the frequency distribution becomes as shown in FIG. The signal is then fed to the antenna 40 through the RF power detector 39.
  • the RF power detector 39 detects the RF transmission power level and outputs the RF power detection signal. Communicating to microprocessor 2 via line 4 1.
  • the microprocessor 2 calculates a correction value of the transmission power according to the detected power level, feeds it back to the RF power amplifier 34 via the RF power control signal 36, and consequently the RF transmitted from the antenna 40.
  • the transmission power is always stable and constant.
  • Block 5 is a control block for controlling the entire apparatus centering on the microprocessor 2.
  • a control signal is output or input to the above-described blocks 1, 2, 3 and blocks 6 and 7, which will be described later.
  • the crystal oscillator 4 generates a clock for operating the microprocessor.
  • the program for operating the microprocessor is written in the control program 3.
  • This control program 3 usually includes initialization of equipment, setting of RF carrier frequency, setting of chip rate, setting of cut-off frequency of digital filter 27, analysis of signal from RF power detector 39, and RF power amplifier.
  • a program for controlling the transmission output by feedback is written, or a program necessary for operations such as analysis of information by communication with an external device, turning on / off of a power supply unit, and a self-diagnosis function is written.
  • Block 6 is an interface for communicating with an external computer, wireless modem, or optical transceiver unit. These interfaces are effective for remote operation from external devices or for remote monitoring of the operation status of the device. When operating this device independently, this block may be removed.
  • Block 7 is centered on a power supply unit 49 for supplying power to the entire device.
  • the power supply unit 49 converts a power supply voltage 48 supplied from outside the device into a proper voltage for operating the inside of the device.
  • the power supply unit 49 can remotely control the power supply via a power on / off control signal 50 by the microphone port processor 2 according to an instruction from the outside of the apparatus. It has a power supply voltage monitoring signal line 51 for monitoring the power supply voltage, and is used by the microprocessor 2 to monitor whether the voltage of the power supply supplied to the inside of the device is normal. 1
  • the carrier frequency selection signal 5 from the microprocessor 2 programmed into the PLL 7 determines the RF carrier center frequency at which V.CO 15 oscillates. If necessary, the control signal 17 of the FM modulation oscillation circuit 16 from the microprocessor is controlled to perform FM modulation, and the amount of frequency shift is adjusted by the adjuster 19 if necessary for more effective suppression effect. adjust.
  • the chip rate selection signal 25 and the digital filter cutoff frequency selection signal 28 from the microprocessor 2 change the chip rate of the PN generator and cut off the digital filter. This is done by changing the frequency.
  • the microprocessor 2 monitors the RF power detection signal line 41, which is the output signal of the RF power detection circuit 39, and the microprocessor 2 uses the feedback signal 36 to transmit the transmission power. Is constant.
  • Figure 6 shows a conceptual diagram of an example of the frequency band used by an actual cellular mobile phone system operator. According to the figure, the channel divisions within the frequency band of operator B are enlarged.
  • the mobile station paging control channel is placed in the frequency band indicated by 60 in FIG. Is assigned.
  • the control program 3 of the present apparatus basically needs to be interfered only with the mobile station paging control channel 59, but it is assumed that the allocated frequency differs depending on the region.
  • the interference radio wave may be transmitted over the entire frequency band shown. Also, by changing the frequency setting range of the control program 3, it is easy to correspond to the frequency band used by other operators.
  • the concept of suppressing incoming calls in a cellular mobile telephone system of a carrier that uses a CDMA (Code Division Multiple Access) system that uses a wideband frequency is basically the minimum that the system cannot tolerate within the channel band. Of interference power And can be realized.
  • the frequency band occupied by one channel of the CDMA system is relatively wider than that of the FDMA / TDMA system as compared with the above-mentioned cellular mobile telephone system of the narrow band communication system.
  • the interference frequency is transmitted over part or all of the bandwidth 61 of the wide CDMA channel.
  • reference numeral 61 denotes one of the CDMA channels in the CDMA cellular mobile telephone system, which includes a carrier center frequency 68, a base station pilot signal 62, a synchronization channel signal 63, a call channel 64, and communication channels 65 to 67.
  • the figure shows the components of each channel provided in.
  • Fig. 7 shows the frequency band 69 of the wireless microphone that must not be suppressed or the base station transmission frequencies 70, 71, and 72 used by the cellular telephone carrier to be suppressed, and the suppression transmitted by the suppression device in one form of this device.
  • This shows the state of the bands BW1, BW2, and BW3.
  • the center frequencies F1, F2, and F3 of the respective bands for which incoming calls are to be suppressed are determined by the carrier frequency selection signal 5 from the microprocessor 2 for the oscillation block composed of the block 3 in FIG.
  • the suppression bands BW1, BW2, and BW3 are determined by the chip rate selection signal 25 and the digital filter cutoff frequency selection signal 28 from the microprocessor 2.
  • the suppression device can be operated according to the frequency band assigned to each carrier.
  • the band 69 used for the wireless microphone in Fig. 7 it is adjacent to the cellular telephone carrier 1, but the high frequency accuracy, stability, and suppression bandwidth of the PLL 7, which are the features of this device, are digitally controlled.
  • the effect of unwanted radiation on adjacent channels is sufficiently suppressed by using a spectrum spread method with sharp and specific cutoff characteristics by Luffyle 27.
  • FIG. 8 shows an example of the appearance of the present apparatus.
  • the device housing 88 that houses the entire device, the suppression module mounting slot 79—83, and the suppression module 84— 8 7 and the transmitting antennas 7 7-7 8 are shown.
  • the suppression modules 84-85 output interference radio waves for radio waves in different frequency bands.
  • the suppression modules 84-85 have already been installed in the suppression module mounting slots 79 and 80, respectively, and the suppression modules 86 and 87 are in preparation for installation, and the suppression module mounting slots 8 3 indicates that it is not mounted.
  • the antennas 77 and 78 may be added each time the suppression module is mounted, or may be shared antennas. It is also conceivable to separate the housing 88 from the antenna by cable connection.
  • the PN generator 24 is configured by a programmable LSI (PFGA: Field Programmable Gate Array), and a flash memory is built in the microprocessor 2. 4, the frequency distribution data, the bandwidth data, the sweep speed data, and the transmission power data are written, and the PN generator 24 operates based on the written data.
  • PFGA Field Programmable Gate Array
  • a plurality of circuit data can be prepared in the flash memory in the following manner.
  • Example 1 first circuit data for emitting the first suppression radio wave having an arbitrary transmission bandwidth.
  • Example 2 second circuit data for emitting a second suppression radio wave having an arbitrary transmission bandwidth.
  • circuit data suitable for a desired bandwidth from a plurality of circuit data in the flash memory, thereby making it possible to select, for example, a base station transmission frequency band assigned to an actual carrier. It is possible to select the size and compatibility of the LSI, and the selected circuit data is taken into the LSI and operated. On the other hand, the transmission frequency (center frequency) and the sweep speed It is not necessary to perform control based on the road route, and switching can be performed by controlling the microprocessor 2 to the PLL 7. It should be noted that a method in which a flash memory has a plurality of circuit data and a desired circuit data is loaded into an LSI for operation and a method of selectively using a ROM substantially equivalently configured can be freely changed. Shall be assumed.
  • FIG. 9 shows a state in which the transmission output obtained under the control of the LSI is observed for a predetermined time.
  • the signal level is a signal level measured at a location at a predetermined distance from the antenna of the present apparatus, and the frequency represents the incoming call suppression frequency. T indicates time.
  • Figure 9 shows that the bandwidth is narrower than the desired suppression band, but falls below the target power value below the total transmission power of the suppression device (total transmission power output within the suppression band within a certain period of time). Is set as wide as possible, and is set narrower than the suppression band, so that the center frequency of the interfering radio wave is changed to cover the suppression band that cannot be completely suppressed. .
  • the setting values are different from those of the LSI program registered in FIG. 9, that is, the bandwidth is narrower than that of FIG.
  • FIG. 3 shows a state in which a plurality of suppression signals are swept in parallel so as to cover a desired suppression band.
  • the valley where the suppression signal is weakened is continuously moving, so that the total transmission power can be reduced so that the suppression effect can be observed. From Fig. 10, it can be understood that in order to hold up, this can also be achieved by providing a band where the transmission output is weakened and fluctuating it so that it does not occur on the same frequency.
  • this device As described above, by installing this device, it is possible to suppress incoming calls of mobile phones within a radius of about 100 to 30 Om, for example, depending on the environment of the installation location. If a wider suppression range is required, the problem can be solved by changing the spread spectrum bandwidth, or by additionally installing a plurality of suppression devices where necessary.
  • this device has high frequency accuracy, unnecessary radiation performance and stability.
  • the present device further has the following possibilities. This is effective not only for the control channel but also for the voice communication channel.
  • the frequency can be easily changed to the frequency of each cellular mobile phone system operator.
  • a constant and stable transmission power can be obtained at any transmission frequency.
  • the size of the area where the deterrent effect is obtained can be changed.
  • the effect of deterrence can be set precisely. By mounting only the modules required for each region, unnecessary capital investment can be prevented. The convenience of the operation of the device can be improved.
  • L Level axis
  • f Frequency axis
  • t Time axis
  • W Suppression bandwidth
  • Tc 1-chip period
  • cut Cutoff frequency
  • P Transmission power
  • PNW Bandwidth after spread modulation
  • CCF carrier center frequency
  • 1 block diagram of main part of the present invention
  • 2 microprocessor for device control
  • 3 control program
  • 4 crystal oscillator
  • 5 carrier frequency selection signal
  • 6 lock Signal
  • 7 frequency divider circuit
  • 8 crystal oscillator
  • 9 PLL output signal
  • 10 loop filter output
  • 11 loop filter output signal
  • 12 adder
  • 13 carrier frequency control terminal
  • 14 VCO (Voltage Controlled Oscillator)
  • 15 PLL feedback signal
  • 16 FM modulation oscillation circuit 17: crystal oscillator
  • 18 FM modulation source signal
  • 19 frequency deviation adjuster
  • 20 frequency deviation control signal
  • 21 FM modulation circuit control signal
  • 22 FM modulation signal
  • 23 Crystal oscillator

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif purgeur d'appel pour téléphone portable dans un système téléphonique mobile cellulaire, sachant qu'il faut respecter les impératifs suivants: adaptation facile du dispositif à la fréquence des ondes radioélectriques émises, selon l'opérateur du système, détermination très précise de la zone effective de purge d'appel, et neutralisation de la dégradation de l'effet de purge d'appel en raison de la limite inhérente à la vitesse d'exploration. Pour respecter ces impératifs, on relie entre eux les éléments suivants: générateur de pseudo-aléa pour fournir des signaux dont le spectre est étalé sur une large gamme de fréquences, filtre numérique permettant d'affiner la caractéristique de coupure de fréquence, circuit mélangeur pour mélanger les signaux avec une fréquence porteuse RF aux fins d'étalement du spectre, circuit générateur de hautes fréquences pour fournir une porteuse haute fréquence, circuit sélecteur pour sélectionner une fréquence, circuit de modulation FM pour augmenter l'effet de purge d'appel selon les besoins, amplificateur de puissance pour amplifier suffisamment la puissance aux fins de transmission depuis une antenne, et enfin antenne et source d'alimentation. Par ailleurs, on utilise une fonction de brouillage avec des fréquences englobant la fréquence de la voie de commande utilisée par le système téléphonique mobile cellulaire dans une gamme spécifiée, fonction de contrôle de la fréquence d'émission et de la puissance de l'onde brouilleuse, et fonction de variation de la puissance d'émission.
PCT/JP2000/008215 1999-11-22 2000-11-21 Dispositif purgeur d'appel pour telephone portable a etalement du spectre WO2001039401A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU14190/01A AU1419001A (en) 1999-11-22 2000-11-21 Call suppressor for spread spectrum portable telephone

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP33211699 1999-11-22
JP11/332116 1999-11-22

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Publication Number Publication Date
WO2001039401A1 true WO2001039401A1 (fr) 2001-05-31

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PCT/JP2000/008215 WO2001039401A1 (fr) 1999-11-22 2000-11-21 Dispositif purgeur d'appel pour telephone portable a etalement du spectre

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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JPH07154299A (ja) * 1993-11-25 1995-06-16 Nec Corp 直接拡散通信妨害装置
JPH10200513A (ja) * 1997-01-07 1998-07-31 Mitsubishi Electric Corp 通信妨害装置
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Publication number Priority date Publication date Assignee Title
WO2005107572A1 (fr) * 2004-05-10 2005-11-17 Olympus Corporation Dispositif pour introduction dans un sujet
CN100450424C (zh) * 2004-05-10 2009-01-14 奥林巴斯株式会社 被检体内导入装置
US7860471B2 (en) 2004-05-10 2010-12-28 Olympus Corporation Body-insertable apparatus
WO2011024323A1 (fr) * 2009-08-28 2011-03-03 日生技研株式会社 Appareil de désactivation de fonction de communication de téléphone mobile

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